If you find yourself at a remote computer, or unsure of your net connection, you can sign into Live.com, Hotmail, and other Windows Live services using a single-use code, which Microsoft will send via SMS to your phone.

Windows Live project leader Omar Shahine explains the why, what, and how-to of Windows Live's single-use codes, which are meant for situations where typing your Live password into a browser might not be the best idea. Whether it's a concern about net connection security or the safety of the computer you're typing on, getting a single-use code isn't too much of a sweat if you have a cellphone handy, and a minute or two of effort could save you many, many minutes of frustration down the line.